Accessory for helmet



FIG. 1 is a front elevational view of an accessory for helmet, showing the new design;

FIG. 2 is a front, left-side, top perspective view thereof;

FIG. 3 is a left-side elevational view thereof, the right-side elevational view (not provided) being a mirror-image thereof;

FIG. 4 is a rear, left-side, bottom perspective view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines depict parts of the accessory for helmet that form no part of the claimed design. 

CLAIM The ornamental design for an accessory for helmet, as shown and described. 